Improve maxTouchPoints example (mdn#42579)

* Improve maxTouchPoints example

* Update files/en-us/web/api/navigator/maxtouchpoints/index.md

* Apply suggestion from @Josh-Cena

---------

Co-authored-by: Joshua Chen <sidachen2003@gmail.com>

Author: tkrotoff

files/en-us/web/api/navigator/maxtouchpoints/index.md

@@ -16,11 +16,17 @@ contact points that are supported by the current device.
 
 A number.
 
-## Examples
+This value is hardware-dependent. Desktop computers without a touchscreen (Mac, Windows and Linux) return 0 while smartphones (Android and iOS) typically return 5.
+
+## Example
 
 ```js
 if (navigator.maxTouchPoints > 1) {
-  // browser supports multi-touch
+  // Device supports tracking at least 2 touch points; offer complex
+  // interaction gestures such as swiping with two/three fingers
+} else {
+  // Device only has 1 touch point or is not a touch screen.
+  // Offer basic gestures such as dragging and clicking
 }
 ```